PROBLEM 7.56 - Organic Chemistry

Question

Question: Classify the carbocations  $1°,2° \mathrm{or} 3°$as or and rank the carbocations in each group in the order of increasing stability.

a.

b.

Step-by-Step Solution

Answer

ANSWER

 a.The order of the increasing stability of the given carbocations is as follows:

C < A < B

 b. The order of the increasing stability of the given carbocations is as follows:

A < B < C

The stability of the carbocations

Depending upon the number of alkyl groups attached to the carbon atom, the carbocations are classified as primary, secondary, and tertiary. 

With the increase in the number of alkyl groups on the positively charged carbon atom, the stability of the carbocation increases.

The order of the stability of the carbocation is as follows:

Tertiary carbocation > Secondary carbocation > Primary carbocation > Methyl carbocation.

 

The tertiary carbocation is the most stable due to the inductive effect of the alkyl groups attached to it.

Stability of the carbocations among the given compounds is as follows:

a. The order of the increasing stability of the given carbocations is as follows:

C < A < B

A

Tertiary carbocation

Most stable

B

Secondary carbocation

Intermediate stability

C

Primary carbocation

Least stable

b. The stability of the given carbocations is as follows:

A < B < C

A

Primary carbocation

Least stable

B

Secondary carbocation

Intermediate stability

C

Tertiary carbocation

Most stable